From what aspect does modern medicine explain the relationship between feet and human health?

Modern medicine believes that there are many blood vessels in the soles of people's feet. Washing feet with hot water can dilate the capillaries of feet, accelerate blood circulation, supply more nutrients to feet, and make the metabolism of feet and legs vigorous. Hot water has a slight stimulating effect. Because countless nerve endings on the soles of the feet are closely connected with the brain, stimulating the nerves on the soles of the feet can inhibit the cerebral cortex, make people feel comfortable and relaxed in the brain, not only speed up sleep, deepen sleep, but also effectively eliminate the fatigue of the day.